if you are using metasploit check this:
meterpreter > sysinfo
Computer : OPTIMUM
OS : Windows 2012 R2 (Build 9600).
Architecture : x64
System Language : el_GR
Domain : HTB
Logged On Users : 97
Meterpreter : x64/windows <--------------*
Anyway, there is a much better exploit than what most people use for Optimum. It doesn’t create so many problems. I will write about this in a few days when Optimum will be retired.